Centrifugal casting machine



Nov. 6, 1928. 1,690,354

J. o. WISHART CENTRIFUGAL CASTING MACKINE Filed Aug. i2, 192v 2Sheets-Sheet IN VEN TOR.

BY Q [014M Km; a VMA.

A TTORNE Y.

Patented Nov: 6, 1928.

UNITED STATES JOHN O. WISnBT, OF MILWAUKEE, WISCONSIN.

omwrmueax. cAs'rmo MACHINE:

Application'fled August 12, 1927. Serial No. 212,477.

wherein the revoluble molds are mounted" upon a vertically disposedrotatable carrier which is given an intermittent motion as the moldsmove from a charging to a discharging position, and to provide acharging spout movable into and out of registry with the mold in itscharging position.

A further object of the invention is to provide a simple and eflicientdrive for rotating the molds during their travel ,from a charging to a.discharging position.

The invention further consists in the several features hereinafter setforth and more particularly defined by claims at the conclusion hereof.H

In the drawings Fig. 1 is a side elevation view of a casting machineembodying the invention, parts being broken away and parts being shownin section; v

Fig. 2 is a front end view of the machine; Fig. 3 is a sectional viewtaken on the line I 33 of Fig. 1;

Fi 4 is a detail sectional view of an adjusta le mold.

Fi 5 is a sectional view of another mold.

Re erring to the drawings, the numeral 5 designates the main frame ofthe machine in which'a shaft or arbor 6 is journalled, having avertically disposed platen or carrier mounted thereon at each end.

Each carrier 7 has a plurality of radially arranged, horizontallydisposed, tubular shaft supports 8 secured thereto, as by bolts 9, and ashaft 10 is journalled in each of said supports and carries a pulley 11at its inner end.

The outer end 12 of each shaft 10 is threaded to receive the threadedopening of a flanged face plate 13 to which a mold 14 is secured in anysuitable manner. As shown each mold .14 has a fla'n e 15 secured to theflange of the plate 13 by Its 16, the plate 13 having a centering recess15 into which a part of said flan e 15' fits. Each mold is in the formof a straight tube 17 for plain bushings or a flan ed tube 17 forflanged bushings projecting rom the flanged base 15 which has a smallcentrally disposed opening 18 alined with a bore 19 in'the shaft 10 topermit gases to escape. The interior diameter of the mold determines theouter cast diameter of the bushng but this diameter may be varied, asshown in Fig. 4, by the insertion of a tubular liner 20 so that a singlemold with liners of different thicknesses may be used to produce severalsizes of bushings.

The rotation of the shaft 6 will, of course, rotate the carriers 7 andthis may be accomp-llshed either by power or by hand-turning of one ofthe carriers. During charging it is desirable to hold the carriers in afixed position and for this purpose I have provided a detent lockingmechanism for each carrier. Each locking mechanism comprises a detent 21pivoted at 22 and engageable at its free end with one of a series ofspaced lugs 23 on the carrier when said carrier is in pouring orcharging position, said detent having a weight 24 urging its free endtoward said carrier and being released by the operators operation of afoot pedal 25 pivoted at 26 and operatively connected to the weightedend of the detentby a pin 27.

During the casting operation the molds 14 are constantly rotated byadrive mechanism associated with the pulleys 11 of each carrier. Thismechanism includes a. belt 28 running over a drive pulley 29, a guidepulley 30, and successively running over several of the pulleys 11, forexample, four of these pulleys during their travel through approximatelyone-half of a revolution of the carrier. Each drive pulley 29 may bedriven in any suitable manner and is shown as mounted on a shaft 31whichis driven from an electric motor 32 by a belt drive including the motorshaft pulley 33, belt 3i and pulley 35 on the shaft 31. Thus, for abouta half a revolution of the carrier a. series of molds are beingcontinuously rotated and as the carrier is shifted empty molds comeunder the action of the belt 28 and filled molds move outof range of thebelt and may be removed for stripping of the casting therefrom.

The metal to be cast is poured into the molds at the charging station,designated by A, and the cast bushing is removed from the mold at adischarging station designated by B, while between these stations on thelower run of the carrier the empty molds are attached to the carrier.For pouring the molten metal into the molds a spout 36, having atrough-shaped end 37 adapted to enter into the mold cavity and providedwith a centering device in the form of a ring 38 having a flange 39whose outer periphery has a close fit with the wall of the mold cavity,is used. This spout 36 is mounted on an upright- 40 secured to arectangular rod 41 slidably mounted and guided in brackets 42 secured toa pedestal or support 43, said rod 41 having a handle 44 forfacilitating its movement into and out of Charging position.

lVith this construction, with the motor 32 running and the spout 36moved to charging position in register with one of the then rotatingmolds at station A, the molten metal, suflicient to form the bushing, ispoured from a ladle or other suitable device into the spout 36 and flowsthrough its trough into the interior of the mold, and due to centrifugalforce it is thrown against the inner wall of the mold and assumes atubular shape and during the passage from this station to thedischarging station B the metal solidifies and becomes set so that thecast bushing may then be removed from the mold. As soon as one of themolds is charged the spout 36 is withdrawn and the operator releases thedetent 21 by pressure upon the foot pedal 25 and then turns the carrier7 to a position where the detent engages the next roje'ction 23 whichbrings an empty mold into charging position. The operations of chargingthe newly presented mold are then repeated and in this way the molds onthe carrier are successively charged, it being noted that the presentmachine has two carriers so that charging of molds by operators at eachend of the machine is taking place and a single motor serves to rotatethe molds of both carriers.

I desire it to be understood that this invention is not to be limited toany particular form or arrangement of parts except in so far as suchlimitations are included in the claims.

What I claim as my invention is:

1. In a centrifugal casting machine, the combination with a verticallydisposed rotatable carrier, of a pluralit of substantially horizontallydisposed mol s mounted on said carrier, said carrier having a chargingposition in which said molds are successively charged and a dischargingposition, means for rotating said molds during their advance fromcharging to discharging position, and means movable relative to thecarrier for charging each mold.

2. In a centrifugal casting machine, the combination with a verticallydisposed rotatable carrier, a plurality of radially arranged,horizontally disposed, rotatable shafts mounted on said carrier andprovided with pulleys, a mold associated with each of said shafts, and apower transmission belt engageable with the pulleys of said shafts torotate said molds during the time the molds move with the carrier from acharging to a discharging position.

3. In a centrifugal casting machine, the combination with a verticallydisposed rotatable carrier, of a plurality of substantially horizontallydisposed molds mounted on said carrier, means for rotating said moldsduring the casting operation, and a spout adapted to be moved to enter amold when in a charging position and provided with means engageahle withthe inner wall of the mold to center the same during the chargingoperation.

4:. In a centrifugal casting machine, the combination with a verticallydisposed rotatable carrier, of a plurality of substantially horizontallydisposed molds mounted on said carrier, means for rotating said molds, aspout adapted to move horizontally to a mold-entering position, andmeans for supporting and guiding said spout in its movements into andout of charging position.

5. In a centrifugal casting machine, the combination with a rotatableshaft, of a pair of spaced carriers mounted thereon, each carrierprovided with a plurality of radially arranged, horizontally disposed,rotatable shafts provided with pulleys, a mold associated with each ofsaid radially arranged shafts, a power transmission belt respectivelyengageable with the pulleys of said shafts of each carrier to rotatesaid molds during the time the molds move with the carriers from acharging to a discharging position, and a single source of power fordriving both of said belts.

6. In a centrifugal casting machine, the combination with a verticallydisposed rotatable carrier, of a plurality of substantially horizontallydisposed molds mounted on said carrier, said carrier having a chargingposition in which said molds are successively charged, means forrotating said molds during the casting operation, means for successivelycharging said molds, and means under the control of the operator forautomatically locking the carrier against advancing when each mold is inits charging position.

7. In a centrifugal casting machine, the combinaton with a verticallydisposed rotatable carrier, of a plurality of substantially horizontallydisposed molds mounted on said carrier, said carrier having a chargingposition in which the molds are successively charged, means for rotatingthe molds during the casting operation, means for succes sively chargingsaid molds, indexing projections on said carrier, and anoperator-controlled detent successively engageable with said projectionsas the carrier advances the molds to successively hold said carrier in acharging position.

8. In av centrifugal casting machine, the combination of a rotatablemold, means for rotating the mold, and a spout adapted to be moved intothe open end of the mold and provided with a flange having a centerportion projecting into and alined with the inner wall of the mold tocenter the same during the charging operation.

9. In a centrifugal castin combination with a verticali g disposedrotatable carrier, or a plurality of substantially horizontally disposedmolds mounted on said carrier, means for rotating the carrier, means forsuccessively charging the molds, and means for rotating the molds duringchargmg.

10. In a centrifugal casting machine, the combination with a verticallydisposed rotatable carrier, of a plurality of horizontally disposedmolds mounted on said carrier, means for simultaneously rotating themolds as they move with the carrier during a part of its completerevolution, and means for successively charging the molds during theirrotating period. v

11. In a centrifugal casting machine, the combination'wit-h a verticallydisposed rotatable carrier, of a plurality of horizontally disposedmolds projecting from one face of said carrier, shafts on which saidmolds are respectively mounted, drive means on said shafts pro ectingfrom the opposite face of the carrier whereby to rotate the molds duringa portion of a revolution of the carrier, and means for successivelycharging the molds.

12. In a centrifugal casting machine, the combination with avertically-disposed r0- machine, the

tatable carrier, a plurality of horizontally disposed rotatable shaftsmounted on said carrier, automatically releasable driving meansassociated with said shafts for rotating said molds during a portion ofthe movement of the carrier, and means for charging the molds.

13. In a centrifugal casting machine, the combination with a rotatableshaft, of a pair of spaced carriers mounted thereon, each carrierprovided with a plurality of radially arranged, horizontally disposed,shafts provided with pulleys, a mold associated with each of saidradially arranged shafts, ashaft provided with pulleys, a powertransmission belt connecting each of said last: named pulleys with thoseof the first-named pulleys and moving with the carrier from a chargingto a discharging position, and motor-drive means for said last-namedshaft.

14. In a centrifugal casting machine, the combination with a pluralityof rotatable molds, and a charging device, of means for successivelycharging saidmolds from saiddevice, means for rotating said molds duringthe charging operation and until the metal becomes set, a rotary supportfor said molds,

and means for imparting a step-by-step ro-' tation to said support.

In testimony whereof, I afiix my signature.

JOHN WISHART,

rotatable.

